From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/rust/neqo-transport/src/stream_id.rs | 170 +++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 third_party/rust/neqo-transport/src/stream_id.rs

(limited to 'third_party/rust/neqo-transport/src/stream_id.rs')

diff --git a/third_party/rust/neqo-transport/src/stream_id.rs b/third_party/rust/neqo-transport/src/stream_id.rs
new file mode 100644
index 0000000000..c82b09d8c4
--- /dev/null
+++ b/third_party/rust/neqo-transport/src/stream_id.rs
@@ -0,0 +1,170 @@
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Stream ID and stream index handling.
+
+use neqo_common::Role;
+
+#[derive(PartialEq, Debug, Copy, Clone, PartialOrd, Eq, Ord, Hash)]
+
+/// The type of stream, either Bi-Directional or Uni-Directional.
+pub enum StreamType {
+    BiDi,
+    UniDi,
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Copy, Ord, PartialOrd, Hash)]
+pub struct StreamId(u64);
+
+impl StreamId {
+    pub const fn new(id: u64) -> Self {
+        Self(id)
+    }
+
+    pub fn init(stream_type: StreamType, role: Role) -> Self {
+        let type_val = match stream_type {
+            StreamType::BiDi => 0,
+            StreamType::UniDi => 2,
+        };
+        Self(type_val + Self::role_bit(role))
+    }
+
+    pub fn as_u64(self) -> u64 {
+        self.0
+    }
+
+    pub fn is_bidi(self) -> bool {
+        self.as_u64() & 0x02 == 0
+    }
+
+    pub fn is_uni(self) -> bool {
+        !self.is_bidi()
+    }
+
+    pub fn stream_type(self) -> StreamType {
+        if self.is_bidi() {
+            StreamType::BiDi
+        } else {
+            StreamType::UniDi
+        }
+    }
+
+    pub fn is_client_initiated(self) -> bool {
+        self.as_u64() & 0x01 == 0
+    }
+
+    pub fn is_server_initiated(self) -> bool {
+        !self.is_client_initiated()
+    }
+
+    pub fn role(self) -> Role {
+        if self.is_client_initiated() {
+            Role::Client
+        } else {
+            Role::Server
+        }
+    }
+
+    pub fn is_self_initiated(self, my_role: Role) -> bool {
+        match my_role {
+            Role::Client if self.is_client_initiated() => true,
+            Role::Server if self.is_server_initiated() => true,
+            _ => false,
+        }
+    }
+
+    pub fn is_remote_initiated(self, my_role: Role) -> bool {
+        !self.is_self_initiated(my_role)
+    }
+
+    pub fn is_send_only(self, my_role: Role) -> bool {
+        self.is_uni() && self.is_self_initiated(my_role)
+    }
+
+    pub fn is_recv_only(self, my_role: Role) -> bool {
+        self.is_uni() && self.is_remote_initiated(my_role)
+    }
+
+    pub fn next(&mut self) {
+        self.0 += 4;
+    }
+
+    /// This returns a bit that is shared by all streams created by this role.
+    pub fn role_bit(role: Role) -> u64 {
+        match role {
+            Role::Server => 1,
+            Role::Client => 0,
+        }
+    }
+}
+
+impl From<u64> for StreamId {
+    fn from(val: u64) -> Self {
+        Self::new(val)
+    }
+}
+
+impl PartialEq<u64> for StreamId {
+    fn eq(&self, other: &u64) -> bool {
+        self.as_u64() == *other
+    }
+}
+
+impl AsRef<u64> for StreamId {
+    fn as_ref(&self) -> &u64 {
+        &self.0
+    }
+}
+
+impl ::std::fmt::Display for StreamId {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        write!(f, "{}", self.as_u64())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::StreamId;
+    use neqo_common::Role;
+
+    #[test]
+    fn bidi_stream_properties() {
+        let id1 = StreamId::from(16);
+        assert!(id1.is_bidi());
+        assert!(!id1.is_uni());
+        assert!(id1.is_client_initiated());
+        assert!(!id1.is_server_initiated());
+        assert_eq!(id1.role(), Role::Client);
+        assert!(id1.is_self_initiated(Role::Client));
+        assert!(!id1.is_self_initiated(Role::Server));
+        assert!(!id1.is_remote_initiated(Role::Client));
+        assert!(id1.is_remote_initiated(Role::Server));
+        assert!(!id1.is_send_only(Role::Server));
+        assert!(!id1.is_send_only(Role::Client));
+        assert!(!id1.is_recv_only(Role::Server));
+        assert!(!id1.is_recv_only(Role::Client));
+        assert_eq!(id1.as_u64(), 16);
+    }
+
+    #[test]
+    fn uni_stream_properties() {
+        let id2 = StreamId::from(35);
+        assert!(!id2.is_bidi());
+        assert!(id2.is_uni());
+        assert!(!id2.is_client_initiated());
+        assert!(id2.is_server_initiated());
+        assert_eq!(id2.role(), Role::Server);
+        assert!(!id2.is_self_initiated(Role::Client));
+        assert!(id2.is_self_initiated(Role::Server));
+        assert!(id2.is_remote_initiated(Role::Client));
+        assert!(!id2.is_remote_initiated(Role::Server));
+        assert!(id2.is_send_only(Role::Server));
+        assert!(!id2.is_send_only(Role::Client));
+        assert!(!id2.is_recv_only(Role::Server));
+        assert!(id2.is_recv_only(Role::Client));
+        assert_eq!(id2.as_u64(), 35);
+    }
+}
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